Just spent another half of day solving the same problem already solved before.
If you have these symptoms:
* Http error 503 Server Not Available
* System login dialog even as you have no Windows authentication enabled
First of all, look at MS SQL Server Reporting Services configuration.
It creates TWO sites during install at localhost:80/Reports and localhost:80/ReportServer.
You should move both of them to other ports using Reporting Services Configuration Manager utility
The deep root reason is described here:
Another reason possible is Skype messenger. It also likes to take the port 80 preventing others from using it.
PS: Don 't forget about another very simple reason for Error 503:
You might be running your site in IIS under an Application Pool with user account credentials, and your password has just expired!
Monday, October 10, 2016
IIS conflicts for port 80 with some applications: 503 Server unavailable or showing Windows Authentication system login dialog
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